<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>lesson 29</title>
    <style>
        .header {
            position: absolute;
        }
    </style>
    <script src="https://unpkg.com/vue@next"></script>
</head>

<body>
    <div id="root"></div>
</body>

</html>

<script>
    // 自定义指令  directive
    const app = Vue.createApp({
        data() {
            return {
                distance: 110
            };
        },
        template: `
        <div>
                <div v-pos:left="distance" class="header">
                    <input />    
                </div>
        </div>
        `
    });

    app.directive('pos', (el, binding) => {
        el.style[binding.arg] = (binding.value + 'px');
    })

    const vm = app.mount("#root");
</script>